Has been underway since 1989. It has been very faithful throughout all sorts of trials and tribulations. For 23 years, it has been 100%. Never a jam or a misfire. Never a hot brass in my face or down my neck/back. It has been my only Glock ever, but now I have a chance to buy another one. I would like to get a .40 S&W - I have brass, bullets, and primers ready. I am trying to choose between a G22 and a G23. I want to use it in Bowling pin matches, so the G22s extra half-inch of barrel length will help in the velocity department. I am also very use to carrying my G17, so the G22 would not be much different. I should get the G22. But I have to wonder if the 4th Gen Glocks are OK.